Detailed timescale of magma-chamber assembly and eruption revealed by ultra-high precision zircon U-Pb geochronology on a Permian caldera plumbing system, Sesia Magmatic System (southern Alps, Italy)

EGU2020-21552, updated on 14 Oct 2020

https://doi.org/10.5194/egusphere-egu2020-21552 EGU General Assembly 2020

© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.

Detailed timescale of magma-chamber assembly and eruption

revealed by ultra-high precision zircon U-Pb geochronology on a

Permian caldera plumbing system, Sesia Magmatic System

(southern Alps, Italy)

Lorenzo Tavazzani1_{, Jörn-Frederik Wotzlaw}2_{, Rita Economos}1_{, Silvano Sinigoi}3_{, Gabriella}

Demarchi3_{, Oscar Laurent}2_{, Cyril Chelle-Michou}2_{, and Olivier Bachmann}2

1_{Roy M. Huffington Department of Earth Science, Southern Methodist University, United States of America}

(ltavazzani@mail.smu.edu)

2_{Institute of Geochemistry and Petrology, ETH Zürich, Switzerland} 3_{Dipartimento di Matematica e Geoscienze, Universita di Trieste, Italy}

In recent years, technical developments in isotope dilution thermal ionization mass spectrometry technique (ID-TIMS) have pushed the precision of single zircon U-Pb geochronology to new limits. The use of interlaboratory calibrated U-Pb tracer solutions for isotopic dilution [1] paired with using newly developed high ohmic resistors (1013_{Ohm) in Faraday cup amplifiers, allow the}

determination of single zircon dates with precision and accuracy at the 0.02 % level [2].This level of analytical precision makes the ID-TIMS technique a geochronological tool able to unravel the detailed temporal evolution of magmatic plumbing systems older than the Mesozoic Era.

[1] Condon, D. J., et al., 2015, Geochim. Cosmochim. Acta, 164, 464-480. [2] Wotzlaw, J. F., et al., 2017, J. Anal. At. Spectrom., 32, 579-586.

[3] Karakas, O., et al., 2019, Geology, 47, 1-5.